If you are amongst the batch of people with access to stock Android 6.0 and don’t want to root for some reason, you can still add custom quick settings to your device without tinkering too much. Developed by XDA Recognized Contributor Quinny899, this app lets you do all that on Stock Android 6.0 without needing root access.
XDA Recognized Developer kotzir, much to the rejoice of many users, has brought Android 6.0 Marshmallow to the Samsung Galaxy Ace 3 in the form of unofficial CyanogenMOd 13 builds for the device. These builds are for the GT-S7275R/B/T variants only, and have a few bugs, so be sure to check the thread before flashing.
Xposed for Marshmallow recently went live, making it more easy for people to take the decision to jump onto the Marshmallow bandwagon. With the help of the community, XDA Member f41lbl0g has put together a list of working Xposed modules on Marshmallow, so if you wanted to know if your favorite module is working before jumping the gun, take a look here!
